Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5a920ea52293d3f…

MALICIOUS

PDF

71.7 KB Created: 2020-12-10 06:28:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 771d22e18506ff9dc6a7a5c40e6b5af9 SHA-1: 1afa46358e9a1ba5416c8966d0b624b99c14f6aa SHA-256: c5a920ea52293d3fda05089deeda1f7892994ac08c1a57e6397db607a94265e5
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URLs, particularly the one pointing to 'ggtraff.ru', are indicative of a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ggtraff.ru/strik?utm_term=centrifugal+force+human+geography+definition
    • https://relugudikovok.weebly.com/uploads/1/3/4/2/134265752/4e0266d2.pdf
    • https://nikuwexipamojag.weebly.com/uploads/1/3/0/8/130813731/gamiduv.pdf
    • https://cdn-cms.f-static.net/uploads/4447658/normal_5f9f242d9144c.pdf
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/guneb-gelomo-bawimemekug.pdf
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/sokubukazaxenivu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc53481c30a162e0c6eae90/t/5fcf81a60ff3944fc55cfa74/1607434678062/37301021213.pdf
    • https://static1.squarespace.com/static/5fc0ecff116eb00e3c4c108e/t/5fcc30ab978da30c56ef4d44/1607217324440/ninja_foodi_air_fry_oven_recipes.pdf
    • https://static1.squarespace.com/static/5fc27b7e60f2895dc1f1e23b/t/5fcdf1715177ea328ce64fd3/1607332212452/toduwitesemadiwagezewov.pdf
    • https://static1.squarespace.com/static/5fce8605262fe64c57b755dc/t/5fd07432a91a8d24337b6e90/1607496754638/zupeli.pdf
    • https://s3.amazonaws.com/tumasun/fofepoxiwanevifiruza.pdf
    • https://s3.amazonaws.com/pilazi/88694287743.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc84.bin
e3294c8c4d62bbb9cc4db600b321e332b1c19bc9eaf6badbf5e6775a90a2ef42
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 5400 bytes
font_01_sfnt_off0000eeba.bin
cc8f83a15727d0883845a9db6ba10ecb9c97d4db82c96ea933fde3e0e51864dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 10484 bytes